Motor-cycle spring.



C. M. A. ROSENDAHL.

MOTOR CYCLE SPRING.

APPLICATION FILED MAYZZ, i914.

Patented Apr. 13. 1915.

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CARL M. A. ROSEND'AHL, 0F KINDRED, NORTH DAKOTA.

MOTOR-CYCLE SPRING.

Application filed May 22, 191 1.

To all whom it may concern:

Be it known that I, CARL M. A. Rosen- DAHL, a citizen of the UnitedStates, residing at Kindred, in the county of Cass and State of NorthDakota, have invented new and useful Improvements in Motor-CycleSprings, of which the following is a specification.

This invention relates to springs for motorcycles, bicycles and similarvehicles, the object in view being to provide a spring mounting for therear driving wheel of such a machine which will add to the comfort ofthe rider and increase the life and durability of the machine as a wholeby absorbing the road shocks.

With the above and other objects in view, the invention consists in thenovel construction, combination and arrangement of parts, as will behereinafter more fully described, illustrated and claimed.

In the accompanying drawings: Figure 1 is a side elevation of the rearportion of a motorcycle showing the spring construction of thisinvention applied thereto. Fig. 2 is a vertical cross section on theline 22 of Fig. 1. Fig. 3 is a vertical longitudinal section takenbetween one pair of yokes. Fig. 4 is a cross section at right angles toFig. 3. Fig. 5 is a fragmentary perspective view of one of the yokes.Fig. 6 is a detail plan view of the chain adjusting device.

Referring to the drawings 1 designates the rear driving wheel of amotorcycle, 2 the rear mud guard, 3 the rear braces, 4 the rear forkarms, 5 the rear axle and 6 the supporting rods for the mud guard orfender 2.

1n carrying out this invention, I provide two curved guides 7 arrangedat opposite sides of the driving wheel and each provided with an axlereceiving forked or slotted extension 8 in which the opposite endportions of the axle 5 are clamped and capable of adjustment for thepurpose of tightening the driving chain (not shown).

In connection with each of the guides 7 ll employ a pair of parallelyokes 9 arranged in spaced relation to each other and at opposite sidesof the respective guide 7, the yokes 9 being connected at points distantfrom each other by means of cross pins 10 reduced at their ends andthreaded as shown to receive nuts 11 and also shouldered at 12 to abutagainst the inner faces of the yokes 9. Around each of said pins 10 isjour- Specification of Letters Patent.

Patented Apr. 13, 1915.

Serial No. 840,321.

naled an anti-friction roller 13. The rollers 13 are movable lengthwiseof curvilinear slots 14 and 15 in the interposed guide 7 so that saidguide serves to direct the up and down sliding movement of the yokes.

The yokes are connected together at points distant from each other bycross pieces 16 and 17 which are secured to ears 18 and 19 on the yokes9. The rear braces 3 are rigidly connected to the upper cross piece 16and the rear fork arms 41 are similarly connected to the bottom crosspiece 17. A curved rod 20 passes through the upper and lower crosspieces 16 and 17 as shown in Fig. 3 and is fastened thereto by nuts 21,said rod passing through a lug 22 on the guide 7 Beneath the lug 22, acoiled expansion check spring 23 is arranged which is supported at itslower end by the bottom cross piece 17, said spring 23 serving to checkthe rebound or upward movement of the frame. The downward movement ofthe frame of the motorcycle is checked by means of a coiled expansionspring 24 which passes around one of the side or terminal portions 25 ofa rod which is arched over the wheel '1 as shown at 26, the ends of therod being fastened at 27 to ears 28 extending from the rear sides of theguides 7 The arched rod thus serves as an equalizer, distributing theweight on both springs 24, it being understood that the spring 24 isduplicated at each side of the driving wheel. The side portions 25 ofthe equalizing rod slide through guides 29 between rearward extensions30 at the upper extremities of the yokes 9.

31 designates a rest which is pivotally connected to lugs 32 on theguides 7 and upheld by a spring catch 33 at the rear extremity of thefender or mud guard 2. 3 1 designates a spring interposed between therest 31 and ears 28 on the guides 7 to assist in lifting the rest 31 andupholding the same when not in use. p

35 designates a chain adjuster having an opening 36 for the rear axleand mounted in a link 37 pivotally connected at 38 to the lug 8 of oneof the guides 7 as shown in Fig. 6, said adjuster being shiftable in afore and aft direction by means of a nut 39. Two of such chain adjustersare used, one at each side of the driving wheel.

From the foregoing description it will now be understood that the rearfork arms 4 and rear braces 3 are rigidly connected to and by the yokes9 and that two sets of yokes are employed, one set at each side of thedriving Wheel and each set operating in conjunction With a guide Whichis supported by the rear axle 5 of the machine. Both the up and downmovements of the yokes are cushioned by the main supporting springs 24and the rebound check springs 23 thus imparting an easy, smooth andelastic action to the rear Wheel and absorbing all ordinary road shocks,adding to the comfort of the rider and increasing the life anddurability of the machine and mechanism thereon.

What I claim is 1. Rear spring construction for motorcycles, comprlsmgupright curvilinear guides carried by the driving Wheel axle at oppositesides of the driving Wheel, yokes slidingly attached to opposite sidesof each of said guides and having the rear fork arms and braces fastenedthereto, and cushioning springs for supporting and resisting the up anddown movements of said yokes relatively to said guides.

52. Rear spring construction for motorcycles, comprising uprightcurvilinear guides carried by the driving Wheel axle at opposite sidesof the driving Wheel, yokes Copies of this patent may be obtained forslidingly attached to opposite sides of each of said guides and havingthe rear fork arms and braces fastened thereto, an equalizing connectionfastened to both guides and extending over the Wheel, and cushioningsprings for supporting and resisting the up and down movements of saidyokes relatively to said guides.

3. Rear spring construction for motorcycles, comprising uprightcurvilinear guides carried by the driving Wheel axle at opposite sidesof the driving wheel, yokcs slidingly attached to opposite sides of eachof said guides and having the rear fork arms and braces fastenedthereto, an equalizing connection fastened to both guides and extendingover the Wheel, and cushioning springs for supporting and resisting theup and down movements of said yokes relatively to said guides, certainof said springs being coiled around said equalizing connection.

In testimony whereof I afiix my signature in presence of two Witnesses.

CARL M. A. ROSENDAHL.

Witnesses:

ADOLPH DOKKEN, JOHN OTTIS.

five cents each, by addressing the Commissioner of Patents, Washington,D. C.

